Spray cooker lightly with oil. Arrange 2 lasagne sheets over base, breaking to fit. Spread one-third of the mince mixture over sheets. Top with 2 sheets. Repeat layers, finishing with mince mixture. Whisk milk, flour and egg together in a jug. Pour over mince mixture. Top with cheese. Reduce heat to low. Cover. Cook for 4 hours or until lasagne is tender. Stand for 5 minutes. Serve with rocket and whole wheat, Low GI bread.